export gridobox page from joomla 3.9 to 5.2 - it works!

Just for information, as I had the need to move my site from joomla 3.9 to 5.2.
- problem 1: no possibility to export the .xml file (in the info browser, I cannot download the file) - solution: the .xml file is available for download on the server in the tmp folder
-problem2 differences in joomla version 3.9 versus 5.2 - no such problem:), gridbox in the latest version imports the pages schema (structure and content) also from e.g. version 2.10

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